to channeling lloyd bentsen's famous attack on dan quayle. >> senator, you're no jack kennedy. >> you can cut tax rates by 20%. >> not mathematically possible. >> it is mathematically possible. it's been done before. it's precisely what we're prosing. >> never been done before. >> it's been done a couple of times actual. >> i never been done. >> jack kennedy lowered tax rates and increased growth. ronald reagan -- >> now you're jack kennedy. >> reporter: well, it's a busy day for three of the four guys on the ticket here. you've got mitt romney who starts his day in north carolina, hits virginia and meets up though with paul ryan in the evening for a joint event in ohio. joe biden, he's going to paul ryan's home state in wisconsin. president obama actually has sort of a down day at the white house, though he does have dinner with a bunch of campaign supporters. matt? >> all right, chuck todd, thank you very much. rachel maddow is the left of "the rachel maddow show" on msnbc and going into this joe biden needed to steady the ship and calm the democratic side. did he accomplish that? >> democr
